Blind stitch sewing machine



L. G. BOWMAN BLIND STITCH SEWING MACHINE 2 Sheets-Sheet 1 Filed April29, 1937 grwwm, I I Lazaklfia GMNMAA;

Aug. 8, 1939, L. e. BOWMAN BLIND STITCH SEWING MACHINE Filed April 29,1937 2 Sheets-Sheet 2 III- Sammy Patented Aug. 8, 1939 Q UNITED STATESPATENT" OFFICE BLIND STITCH SEWING MACHINE Louis G. Bowman, St. Louis,Mo., assignor to Lewis Invisible Stitch Machine Company, St. Louis, Mo.,a corporation of Maine Application April 29, 1937, Serial No. 139,809

20 Claims. (01; 1121'76) This invention relates to improvements inFigure 6 is a transverse sectional view taken on blind stitch sewingmachines generally, although the line E of Figure 1, more particularlyto the presser feet thereof, Figure '7 is a perspective view of theshiftable and embodies certain improvements over Patent interponentassembly, '5- 1,740,901, issued December 24, 1929, to. Charles Figure 8is a diagrammatic view showing the 5 -W. Mueller. relation between theridge forming element, the Heretofore, when operating a machine as bris, t e ne e, t e Vertically adjustable shown in said patent, for sewingsleeve linings crown, the adjustable stop for limiting the upto a' coat,it was customary for the operator when ward movement of the crown, andthe interpo- 419 operatingon one side of the coat to sew the main nentin its normal or inoperat ve position 10 liningto the body fabric fromthe bottom of the tw n the cr wn and th adjusta s p, and coat to the armhole, and on the other side of the ure 9 is a Si ar w ut Showing thecoat to sew the main lining to the body fabric terponent in itsoperative position between the from the arm hole to the bottom of thecoat; crown and the adjustabl S D- that is, stitch the main lining tothe body fabric Like reference numerals designate correspondalong theentire side seams of the coat. This ns pa throughout the Several figures0f the method necessitated'the employment of a hand drawin sewer to ripthe stitcheswhere the main lining is e presser Ot A Which emb es ynvenattached to the sweat shield at each side of the e ncludes a heel 5and a t e a is p v d d coat'at the upper pqrtion of each side eam ad-With an opening 1 located therebetween and jacent the arm hole in orderto insert the sleeve thr u h which th sup p s d fabrics C are lining;and then fell by hand around each arm P ed upw y by a Verticallyyieldable ridge hole, forming element D into position to be penetratedThe principal object of my invention is to proby the needle E. Theneedle E, as in the Mueller vide a, presser foot by means of which thest of Patent 1,740,901, oscillates about a fixed axis 2 the abovedescribed operation will be reduced and o at d a ove t Opening 7 and hasits P Of the production will be increased. movement in the line of feed,and the foot is Another object of the invention is to provide retainedin a stationary manner on the machine an attachment to the presser footof said prior frame, the toe 6 of the f o immediately in front 39 patentconstruction, whereby the operator can of e openin S provided with aneedle 30 sew the main lining to the sweat shield only and uide 8-thereby avoid stitching the body fabric for a o ed in the under face ofthe foot and on short distance, say about two inches, thereby the g thand Side Of the p iS a a sallowing the hand sewer to sew only thesleeve verse recess 9 in which is mounted a crown F. lining to the mainlining without havin to ri The inn r end of t r wn pr in aid 35 thestitches for said short distance. p ning 1 a v the ridge in element D nWith these and other object in view whi h is recessed to receive saidelement and the ridge will more fully appear, the nature ofthe inve offabrics B, C, the inner end of the element tertionxwill be more clearlyunderstood by following mihetihg Short of the needleparth whereby the 40t descrjptign th appended l i d th needle may pass above the element andat the 40 several views illustrated in the accompanying e t of t e rown.he Outer end Of the crown drawings. is provided with a rigid arm l0which extends In the drawings: rearwardly along the right hand edge IIof the Figure 1 is a top plan view of the presser foot presser t a d s pv t d t the latter y a showing. the inter onentin its operativeposition, screw l2 wh y the crown y h v a vertica 45 Figure 2 is apartial top plan view of the movement. presser foot showing theinterponent in its inop- A vertically adjustable stop screw G having aerative position, rounded lowerend I4 is threadedly engaged in Figure 3is a bottom plan view of the presser the foot directly above the crownand functions foot showing the interponent in its inoperative tovariably l t t pwa v e t of Said 50 position, crown.

Figure 4 is an enlarged right hand elevation of A manually operablelever H extends rearthe presser foot; wardly along the right hand sideof the foot and Figure 5 is an enlarged front elevation of the has itsrear end positioned between laterally ex- 55 presser foot, tending earsl5, l5 integral with the crown arm I0 and fulcrumed thereto by avertical screw l6.

An interponent I is provided at its outer end with a transverse slot [1,and a pivot pin l8 which is mounted on the lever H passes through saidslot. The inner end of the interponent has its upper face beveled as atI9 to form a wedge shape. The interponent projects towards the stopscrew G and is guided by a slot 20 formed in the front end of the crownarm ID, the slot forming a resultant finger 2| thereabove, and thelatter having a beveled outer corner 22 along its upper edge. It will,therefore, be seen that when the lever H is moved inwardly towards thefoot, the wedge shaped inner end of the interponent will enter betweenthe rounded lower end of the stop screw G and the crown F and depressthe latter against the upwardly spring pressed ridge forming element D.

A spring latch or finger J which is secured to the lever H by the pinl8, overlies the interponent I, and is provided with a downwardlyinclined inner end 23. When the lever is moved inwardly the inner end 23will engage the beveled corner 22 of the finger 2| and cam over the sameto thereby retain the interponent in its operative position.

In order to limit the inward movement of the interponent I and therebyvariably limit the depression of the crown F whereby a predetermineddepth of needle penetration in the fabric may be obtained, I haveprovided the lever H with an adjustable stop screw K which engages theadjacent side face of the foot when said lever is swung inwardly.

In order to limit the outward swinging movement of the lever H andthereby retain the interponent in the guiding slot 20, I have providedthe lever with an arm 24 which extends rearwardly beyond the leverfulcrum l6 for contact with the head of the screw 12.

Itis to be understood that the vertically yieldable ridge formingelement D is moved upwardly and downwardly in suitably timed relationwith the needle reciprocations by mechanism not shown but which is wellknown in the art. The particular means for operating the element D formsno part of the present invention, and since an example of mechanism ofthis character is to be found in the Charles W. Mueller Patent 1,740,901hereinbefore referred to, detailed description thereof herein is deemedunnecessary.

From the foregoing, it will be seen that superposed fabrics B, C are fedrearwardly below the needle path, and that the ridge forming element Dprojects a ridge of said fabrics upwardly through the presser footopening into needle penetrating position. When the interponent 1 is inits normal or inoperative position as shown in Figure 8, the stop screwG is first adjusted vertically whereby the needle will engage bothfabric layers. Whenever, it is desirable to lessen the depth of needlepenetration whereby the needle will engage the superposed layer only,the lever H is swung inwardly to effect a depression of the crown F asshown in Figure 9 together with both fabrics and the ridge formingelement D. Whenever itis desirable to return the crown to its initialposition and thereby have the needle engage both fabrics, the lever isswung to the right and the interponent is withdrawn to its inoperativeposition as shown in Figure 8 whereby the spring pressed ridge formingelement will return the crown to its initial position against the stopscrew.

It is of course to be understood that the details of structure andarrangement of parts may be variously changed and modified withoutdeparting from the spirit and scope of my invention.

I claim:

1. In a blind stitch sewing machine, the comination with a stationarypresser foot having an opening, of a reciprocatory needle operatingabove said opening, a vertically yieldable ridge forming element locatedbelow said opening for projecting a ridge of fabric upwardly into needlepenetrating position, a vertically movable crown mounted on the foot tolimit the upward move ment of the ridge forming element, a stop mountedon the foot to limit the upward movement of the crown, and a manuallyoperable interponent supported on the foot and movable to a positionbetween the stop and the crown to depress the latter and thereby reducethe depth of needle penetration in the fabric.

2. In a blind stitch sewing machine, the combination with a stationarypresser foot having an opening, of a reciprocatory needle operatingabove said opening, a vertically yieldable ridge forming element locatedbelow said opening for projecting a ridge of fabric upwardly into needlepenetrating position, a vertically movable crown mounted on the foot tolimit the upward movement of the ridge forming element, a stop mountedon the foot to limit the upward movement of the crown, and a manuallyoperable interponent supported on the foot and movable to a positionbetween the stop and the crown to depress the latter and thereby reducethe depth of needle penetration in the fabric, said interponent beingmovable in a horizontal plane and provided with a wedge-shaped inner endfor entering between the stop and the crown.

3. In a blind stitch sewing machine, the combination with a stationarypresser foot having an opening, of a reciprocatory needle operatingabove said opening, a vertically yieldable ridge forming elementlocatedbelow said opening for projecting a ridge of fabric upwardly into needlepenetrating position, a vertically movable crown mounted on the foot tolimit the upward movement of the ridge forming element, a stop mountedon the foot to limit the upward movement of the crown, a manuallyoperable interponent supported on the foot and movable to a positionbetween the stop and the crown to depress the latter and thereby reducethe depth of needle penetration in the fabric, and adjustable means forlimiting the movement of the interponent and thereby variably limit thedownward movement of the crown.

4. In a blind stitch sewing machine, the combination with a stationarypresser foot having an opening, of a reciprocatory needle operatingabove said opening, a vertically yieldable ridge forming element locatedbelow said opening for projecting a ridge of fabric upwardly into needlepenetrating position, a vertically movable crown mounted on the foot tolimit'the upward movement of the ridge forming element, a stop mountedon the foot to limit the upward movement of the crown, a manuallyoperable interponent supported on the foot and movable to a positionbetween the stop and the crown to depress the latter and thereby reducethe depth of needle penetration in the fabric, and a spring latch forretaining the interponent in its operative position.

5. In a blind stitch sewing machine, the combination with a stationarypresser foot having an opening, of a reciprocatory needle operatingabove said opening, a vertically yieldable ridge forming element locatedbelow said opening for projecting a ridge of fabric upwardly into needlepenetrating position, a vertically movable crown mounted on the foot tolimit the upward movement 'of'theridge forming element, a verticallyadjustable stop mounted on the foot to limit the upward movement of thecrown, and a manually operable interponent supported on the foot andmovable to a position between the stop and the'crown to depress thelatter and thereby reduce the depth of needle penetration in the fabric.

6. In a blind stitch sewing machine, the combination with a stationarypresser foot having anv opening, of a reciprocatory needle operatingabove said opening, a vertically yieldable ridge forming element locatedbelow said opening for projecting a ridge of fabric upwardly into needlepenetrating position, a vertically movable crown mounted on the foot tolimit the upward movement of the ridge forming element, a stop mountedon the foot to limit the upward movement of the crown, a manuallyoperable lever mounted onthe foot to swing about a vertical fulcrum, andaninterponent connected to said lever and movable to a position betweenthe stop and the crown to depress the latter and thereby reduce thedepth of needle penetration in the fabric.

'7. In a blind stitch sewing machine, the combination with a stationarypresser foot having an opening, of a reciprocatory needle operatingabove said opening, a vertically yieldable ridge forming element locatedbelow said opening for projecting a ridge of fabric upwardly into needlepenetrating position, a vertically movable crown mounted, on the footto' limitthe upward movement of the ridge forming element, a stopmounted on thefoot to limit the upward movement of the crown, a manuallyoperable lever mounted on the foot to swing about a vertical fulcrum, aninterponent connected to said lever and movable to a position betweenthe stop and the crown to depress the latter and thereby reduce thedepth of needle penetration in the fabric, said interponent beingprovided with a wedge-shaped inner end for entering between the stop andthe crown, and an adjustable stop mounted on the lever for cooperationwith the foot to limit the inward movement of the interponent to therebyvariably limit the downward movement of the crown.

8. In a blind stitch sewing machine, the combination with a stationarypresser foot having an opening, of a reciprocatory needle operatingabovesaid opening, a vertically yieldable ridge forming element locatedbelow said opening for projecting a ridge of fabric upwardly into needlepenetrating position, a vertically movable crown mounted on the foot tolimit the upward movement of the ridge forming element, a stop mountedon the foot to limit the upward movement of the crown, a manuallyoperable lever mounted on the foot to swing about a vertical fulcrum, aninterponent connected to said lever and movable to a position betweenthe stop and the crown to depress the latter and thereby reduce thedepth of needle penetration in the fabric, said interponent beingprovided with a wedge-shaped inner end for entering between the stop andthe crown, an adjustable stop mounted on the lever for cooperation withthe foot to limit the inward movement of the interponent to therebyvariably limit the downward movement of the crown, and a spring latchmounted on the lever for cooperation with the foot for retaining theinterponent in its operative position.

bination with a stationary presser foot having an opening, of areciprocatory needle operating above said opening, a verticallyyieldable ridge forming element located below said opening forprojecting a ridge of fabric upwardly into needle penetrating position,a crown located above the ridge forming element to limit the upwardmovement thereof, an arm rigidly connected with the crown andhavingpivotal connection with the foot, a vertically adjustable stopscrew mounted on the foot to limit the upward movement of the crown andprovided wtih a rounded lover end, a manually operable lever pivoted onthe foot to swing about a vertical fulcrum, and an interponent connectedto said lever and movable to a position between the stop and the crownto depress the latter and thereby reduce the depth of needle penetrationin the fabric, said interponent being provided with a wedge-shaped innerend for entering between the stop and the crown.

10. In a blind stitch sewing machine, the combination with a stationarypresser foot having an opening. of a reciprocatory needle operatingabove said opening, a vertically yieldable ridge forming element locatedbelow said opening for projecting a ridge of fabric upwardly into needlepenetrating position, a crown located above the ridge forming element tolimit the upward movement thereof, an arm rigidly connected with thecrown and having pivotal connection with the foot, a verticallyadjustable stop screw mounted on the foot to limit the upward movementof the crown and provided with a rounded lower end, a manually operablelever pivoted on the foot to swing about a vertical fulcrum, aninterponent connected to said lever and movable to a position betweenthe stop and the crown to depress "the latter and thereby reduce thedepth of needle penetration in the fabric, said interponent beingprovided with a wedge-shaped inner end for entering between the stop'andthe crown, and an adjustable stop mounted on the lever for cooperationwith the foot to limit the inward movement of the interponent to therebyvariably limit the downward movement of the crown.

11. In a blind stitch sewing machine, the combination with a stationarypresser foot having an opening, of a reciprocatory needle operatingabove said opening, a vertically yieldable ridge forming element locatedbelow said opening for projecting'a ridge of fabric upwardly into needlepenetrating position, a crown located above the ridge forming element tolimit the upward movement thereof, an arm rigidly connected with thecrown and having pivotal connection with the foot, a verticallyadjustable stop screw mounted onthe foot to limit the upward movement ofthe crown and provided with a rounded lower end, a manually operablelever pivoted on the foot to swing about a vertical fulcrum, aninterponent connected to said lever and movable to a position betweenthe stop and the crown to depress the latter and thereby reduce thedepth of needle penetration in the fabric, said interponent beingprovided with a wedge-shaped inner end for entering between the stop andthe crown, and a spring latch mounted on the lever for cooperation withthe foot for retaining the interponent in its operative position.

12. In a blind stitch sewing machine, the combination with a stationarypresser foot having an opening, of a reciprocatory needle operatingabove said opening, a vertically yieldable ridge forming element locatedbelow said opening for 9. In a blind stitch sewing machine, thecomprojecting a ridge of fabric upwardly into needle penetratingposition, a crown located above the ridge forming element to limit theupward movement thereof, an arm rigidly connected with the crown andhaving pivotal connection with the foot, a vertically adjustable stopscrew mounted on the foot to limit-the upward movement of the crown andprovided with a rounded lower end, a manually operable lever pivoted onthe foot to swing about a vertical fulcrum, an interponent connected tosaid lever and movable to a position between the stop and the crown todepress the latter and thereby reduce the depth of needle penetration inthe fabric, said interponent being provided with a wedge-shaped innerend for entering between the stop and the crown, an adjustable stopmounted on the lever for cooperation with the foot to limit the inwardmovement of the interponent to thereby variably limit the downwardmovement of the crown, and a spring latch mounted on the lever forcooperation with the foot for retaining the interponent in its operativeposition.

13. The combination with a presser foot having an opening, a verticallymovable crown mounted on the foot and projecting into said opening, astop mounted on the foot to limit the upward movement of the crown, anda manually operable interponent supported on the foot and movable to aposition between the stop and the crown to depress the latter.

14. The combination with a presser foot having an opening, a verticallymovable crown mounted on the foot and projecting into said opening, astop mounted on the foot to limit the upward movement of the crown, anda manually operable interponent supported on the foot and movable to aposition between the stop and the I crown to depress the latter, saidinterponent being movable in a horizontal plane and provided with awedge-shaped inner end for entering between the stop and the crown.

15. The combination with a presser foot having an opening, a verticallymovable crown mounted on the foot and projecting into said opening, astop mounted on the foot to limit the upward movement of the crown, amanually operable interponent supported on the foot and movable to aposition between the stop and the crown to depress the latter, andadjustable means for limiting the movement of the interponent andthereby variably limit the downward movement of the crown.

16. The combination with a presser foot having an opening, a verticallymovable crown mounted on the foot and projecting into said opening, astop mounted on the foot to limit the upward movement of the crown, amanually operable interponent supported on the foot and movable to aposition between the stop and the crown to depress the latter, and aspring latch for retaining the interponent in its operative position.

17. The combination with a presser foot having an opening, a verticallymovable crown mounted on the foot and projecting into said opening, avertically adjustable stop mounted on the foot to limit the upwardmovement of the crown. and a manually operable interponent supported onthe foot and movable to a position between the stop and the crown todepress the latter.

18. The combination with a presser foot having an opening, a verticallymovable crown mounted on the foot and projecting into said opening, astop mounted on the foot to limit the upward movement of the crown, amanually operable lever mounted on the foot to swing about a verticalfulcrum, and an interponent connected to said lever and movable to aposition between the stop and the crown to depress the latter.

19. The combination with a presser foot havin an opening, a verticallymovable crown mounted on the foot and projecting into said opening, astop mounted on the foot to limit the upward movement of the crown, amanually operable lever mounted on the foot to swing about a verticalfulcrum, an interponent connected to said lever and movable to aposition between the stop and the crown to depress the latter, saidinterponent being provided with a wedge-shaped inner end for enteringbetween the stop and the crown, and an adjustable stop mounted on thelever for cooperation with the foot to limit the inward movement of theinterponent and thereby variably limit the downward movement of thecrown.

20. The combination with a presser foot having an opening, a verticallymovable crown mounted on the foot and projecting into said opening, astop mounted on the foot to limit the upward movement of the crown, amanually operable lever mounted on the foot to swing about a verticalfulcrum, an interponent connected to said lever and movable to aposition between the stop and the crown to depress the latter, saidinterponent being provided with a wedge-shaped inner end for enteringbetween the stop and the crown, an adjustable stop mounted on the leverfor cooperation with the foot to limit the inward movement of theinterponent and thereby variably limit the downward movement of thecrown, and a spring latch mounted on the lever for cooperation with thefoot for retaining the interponent in its operative position.

LOUIS G. BOWMAN.

